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1275 Engine Rebuild


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#91 Wiggy

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Posted 28 March 2019 - 12:52 PM

I had the 2.76 in my MPi S. Was nice to cruise with, but a pain at lower speeds, especially with the lack of low down torque. Kept having to shift to 1st.

Fitted a 3.1 and cam to boost low down torque and I think it's the perfect balance.

With more low down torque, you can get away with a taller final drive, as the Turbo boys do.

#92 Will96

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Posted 29 March 2019 - 11:32 AM

Yeah. With the upgrade to a 1380 I am going have more torque but then i don't want to go and remove all of that with too tall of a final drive. A 2.9 I think would be the tallest I should realistically go as I don't want to make a mini that more of a hastle to drive in towns and citys. But yeah a 3.1 would be perfect other than it looks as though I'd have to buy one. And that's not so perfect lol

#93 macaldron

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Posted 29 March 2019 - 03:08 PM

Last year I built up a 1330 with an SW5 cam, HIF44 carb, electronic dizzy, big valve 12g940 head, and a 3.1 fd...it is a BLAST to drive!  Around the back roads we can use 2nd and 3rd and enjoy the torque, and on the freeway at 65-70 mph it's not any louder than the road noise.  I considered a 3.44fd, and went with the 3.1 because, well, it's what I had, but also I didn't want to sit at quite so high RPM at speed.  I'm completely satisfied with the 3.1.  If I had to do again, I'd still go with the 3.1.



#94 Will96

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Posted 30 March 2019 - 10:06 AM

So just checked my 2nd gearbox and its running a 3.64. So looks like I'll be running a 3.44 to begin with and upgrading to a 3.1 or 2.9 at a later date once everything else with the engine is finished and working

#95 Inno

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Posted 31 March 2019 - 11:52 PM

Last year I built up a 1330 with an SW5 cam, HIF44 carb, electronic dizzy, big valve 12g940 head, and a 3.1 fd...it is a BLAST to drive!  Around the back roads we can use 2nd and 3rd and enjoy the torque, and on the freeway at 65-70 mph it's not any louder than the road noise.  I considered a 3.44fd, and went with the 3.1 because, well, it's what I had, but also I didn't want to sit at quite so high RPM at speed.  I'm completely satisfied with the 3.1.  If I had to do again, I'd still go with the 3.1.

I am building almost similar configuration and have 3.2 diff from 1992 Cooper engine....so guess it shall be more than a fun to drive...I was also looking for 3.44 but now convinced I am more than ok with 3.2...even for a highway but I think I will avoid it whenever is possible and enjoy classic roads and curves instead...



#96 Will96

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Posted 04 April 2019 - 06:17 PM

Moving onto dizzy then. I'm aware that 123 ignition models would be the obvious choice. However in the projects current state I just want to get this engine running and things like the dizzy can be upgraded in the future once I know the engine runs and I can spend a bit more money on fine tweaking it for performance. So that being said has anyone had any experience with this mini spares model (http://www.minispare.../C-27H7701.aspx) I know they're guilty of tooting their own horn a bit too much in certain areas. However, I have put an evolution001 cam in the build so makes sense to me in pairing the two items up. Thanks :)

#97 johnR

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Posted 05 April 2019 - 12:22 PM

I've put a 123+tune Bluetooth on the engine I'm just finishing - I really like the immobiliser function and flexibility. SC parts gave me discount which helped as well. Can't wait to get it back in the car and out on the road.



#98 Will96

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Posted 05 April 2019 - 01:29 PM

To be fair I might have a 65DM4 sat needing some TLC. Just need to clean the body do I can identify it properly, but realistically I suppose that would put me on until I can afford something like the 123 you mentioned John. I had a look at them and they definitely look the dogs whoo-haas

#99 Will96

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Posted 06 April 2019 - 10:52 PM

Right. Clarified that it's a 65dm4 dizzy, needs a new rotor arm and cap, but other than that the vacuum advance works fine. So from what I've read on here as long as I get the curve seen to by a specialist, it should do for now ar least? Also have a hif6 which I know shares parts with hif44's so if i bought a kit for a 44 would i be able to service the 6?

#100 Will96

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Posted 09 April 2019 - 06:27 PM

My current 998 is fitted with standard points and condenser. The car is a 1977 850 with modified wiring to run the a+ engines. Since I plan on fitting a 65dm4 dizzy with a DLB105 coil, would I need to modify the wiring further to run electronic ignition and fit the intended dizzy. Thanks




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